From: Alexander Graf <agraf@suse.de>
To: Cyril Bur <cyril.bur@au1.ibm.com>, qemu-ppc@nongnu.org
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v2] PPC: Introduce the Virtual Time Base (VTB) SPR register
Date: Fri, 27 Feb 2015 16:28:09 +0100 [thread overview]
Message-ID: <54F08D09.6050508@suse.de> (raw)
In-Reply-To: <1424992797-10016-1-git-send-email-cyril.bur@au1.ibm.com>
On 27.02.15 00:19, Cyril Bur wrote:
> This patch adds basic support for the VTB.
>
> PowerISA:
> The Virtual Time Base (VTB) is a 64-bit incrementing counter.
> Virtual Time Base increments at the same rate as the Time Base until its value
> becomes 0xFFFF_FFFF_FFFF_FFFF (2 64 - 1); at the next increment its value
> becomes 0x0000_0000_0000_0000. There is no interrupt or other indication when
> this occurs.
>
> The operation of the Virtual Time Base has the following additional
> properties.
> 1. Loading a GPR from the Virtual Time Base has no effect on the accuracy of
> the Virtual Time Base.
> 2. Copying the contents of a GPR to the Virtual Time Base replaces the
> contents of the Virtual Time Base with the contents of the GPR.
>
> Signed-off-by: Cyril Bur <cyril.bur@au1.ibm.com>
Thanks, applied to ppc-next.
Alex
next prev parent reply other threads:[~2015-02-27 15:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-26 23:19 [Qemu-devel] [PATCH v2] PPC: Introduce the Virtual Time Base (VTB) SPR register Cyril Bur
2015-02-27 15:28 ` Alexander Graf [this message]
2015-02-27 21:18 ` [Qemu-devel] [Qemu-ppc] " Alexander Graf
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